CN110786057A

CN110786057A - Carrier selection method and communication equipment

Info

Publication number: CN110786057A
Application number: CN201880041686.5A
Authority: CN
Inventors: 唐海
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2017-09-15
Filing date: 2018-05-03
Publication date: 2020-02-11
Also published as: CN111277979B; EP3661237A1; AU2018331013A1; PL3661237T3; KR20240013867A; CL2020000669A1; US20220361172A1; EP4164259A1; CN110870284A; JP2020533921A; FI3661237T3; JP7101762B2; US20200196310A1; WO2019052148A1; IL273275B2; JP7124066B2; JP7124066B6; CN111277979A; JP7101762B6; EP3664533A1

Abstract

The application discloses a carrier wave selection method and communication equipment, wherein the method comprises the following steps: acquiring channel occupation ratios CBR of a plurality of candidate carriers; filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers; and selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers. Therefore, the filtering processing is carried out on the measurement results of the CBRs of the carriers, and the carrier selection is carried out in the carriers on the basis of the CBRs of the carriers after the filtering processing, so that the carrier selection is realized, the carrier switching frequency is reduced, and the stability of the system is ensured.

Description

Carrier selection method and communication equipment

This application claims priority from PCT patent application filed on 15.9.2017 with the chinese patent office, application number PCT/CN2017/101903 entitled "method and communication device for carrier selection", the entire contents of which are incorporated herein by reference.

This application claims priority from PCT patent application No. PCT/CN2017/103819 entitled "method of carrier selection and communication device", filed by the chinese patent office on 27/9/2017, the entire contents of which are incorporated herein by reference.

This application claims priority from PCT patent application filed on 27/3/2018 at the chinese patent office under application number PCT/CN2018/080715 entitled "method and communication device for carrier selection", the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to the field of wireless communication, and in particular, to a method for selecting a carrier and a communication device.

Background

A Vehicle networking or Vehicle-to-Device (V2X) communication system is a Sidelink (SL) transmission technology based on Device-to-Device (D2D) communication, and is different from a method of receiving or sending data through a base station in a conventional Long Term Evolution (LTE) system, and the Vehicle networking system adopts a terminal-to-terminal direct communication method, so that the Vehicle networking or Vehicle-to-Device (V2X) communication system has higher spectral efficiency and lower transmission delay.

In a vehicle networking system supporting multi-carrier transmission, a terminal device may use one or more carriers of a candidate plurality of carriers for current data transmission. Therefore, how to select the carrier by the terminal device or the base station becomes an urgent problem to be solved.

Disclosure of Invention

The embodiment of the application provides a carrier selection method and communication equipment, and the communication equipment can effectively select carriers and simultaneously keep the stability of a system.

In a first aspect, a method for carrier selection is provided, including: acquiring channel occupation ratios CBR of a plurality of candidate carriers; filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers; and selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Therefore, the filtering processing is carried out on the measurement results of the CBRs of the carriers, and the carrier selection is carried out in the carriers on the basis of the CBRs of the carriers after the filtering processing, so that the carrier selection is realized, the carrier switching frequency is reduced, and the stability of the system is ensured.

In a possible implementation manner, the filtering the CBRs of the multiple carriers includes: and performing smooth filtering on the CBRs of the multiple carriers.

In one possible implementation manner, the CBR of each carrier of the multiple carriers after the smoothing filtering is: CBR _ new ═ a × CBR _ old + (1-a) × CBR _ current,

the carrier wave selection method comprises the steps of filtering each carrier wave, wherein CBR _ new is the CBR of each carrier wave after filtering, CBR _ current is the CBR of each carrier wave before filtering, CBR _ old is the CBR of each carrier wave after filtering when the last carrier wave is selected, and a is a filter coefficient and is more than or equal to 0 and less than or equal to 1.

In one possible implementation, the method further includes: determining whether the CBR of a filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes: and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In one possible implementation, the plurality of carriers includes the first carrier.

In one possible implementation, the plurality of carriers does not include the first carrier.

In one possible implementation, the method further includes: determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In the embodiment, whether carrier selection is performed is judged according to the difference between the CBRs of the current carrier and other carriers, and when the difference between the CBRs meets the condition, carrier selection is performed based on the CBRs after filtering processing, so that the carrier switching frequency is further reduced, and the stability of the system is ensured.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the plurality of filtered carriers exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

In one possible implementation, the method is performed by a terminal device, and the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by a network device, wherein the configuration information comprises the first threshold.

In one possible implementation, the method is performed by a network device, and the method further includes: and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset time duration, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, and the filtered CBR of the first carrier is less than or equal to a second threshold, performing carrier selection on carriers whose CBR is less than or equal to the second threshold after filtering.

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting any carrier from the multiple carriers as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used.

In a possible implementation manner, the carrier selection performed in the multiple carriers according to the filtered CBRs of the multiple carriers includes: and when the value of the resource reselection counter C _ resel is equal to 0, selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In this embodiment, the carrier selection process does not depend on the ProbResourceKeep parameter, but determines whether carrier selection is currently required based on the resource reselection counter C _ resel, and performs carrier selection based on the CBR after filtering processing when carrier selection is required, thereby reducing the frequency of carrier switching and ensuring the stability of the system.

In a possible implementation manner, each carrier in the multiple carriers is configured with a corresponding C _ resel, where when a value of the C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, selecting the carrier in the plurality of carriers according to the filtered CBR of the plurality of carriers.

In a possible implementation manner, the multiple carriers are configured with the same C _ resel, where when a value of the C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and when the same value of C _ resel is equal to 0, selecting carriers from the multiple carriers according to the filtered CBRs of the multiple carriers.

In one possible implementation, the method further includes: when the value of C _ resel is equal to 0, determining whether the CBR of a filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

In a possible implementation manner, each carrier of the multiple carriers is configured with a corresponding C _ resel, where determining whether the CBR of the filtered first carrier exceeds a third threshold when the value of the C _ resel is equal to 0 includes: when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the filtered CBR of the first carrier exceeds the third threshold.

In a possible implementation manner, the same C _ resel is configured on the multiple carriers, where the determining whether the CBR of the filtered first carrier exceeds a third threshold when the value of the C _ resel is equal to 0 includes: determining whether the filtered CBR of the first carrier exceeds a third threshold when the value of the same C _ resel is equal to 0.

In one possible implementation, the method further includes: when the value of C _ resel is equal to 0, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

In this embodiment, whether carrier selection is currently required is determined based on the resource reselection counter C _ resel, and when carrier selection is required, whether the difference between CBRs of the current carrier and other carriers meets the condition is determined, and when the difference between CBRs meets the condition, carrier selection is performed based on the CBRs after filtering, so that the carrier switching frequency is further reduced, and the stability of the system is ensured.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

In a possible implementation manner, configuring a corresponding C _ resel on each carrier of the multiple carriers, where determining whether a difference between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold when a value of the C _ resel is equal to 0 includes: when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

In a possible implementation manner, configuring the same C _ resel on the multiple carriers, where determining whether a difference between a CBR of the first filtered carrier and a CBR of the second filtered carrier exceeds a first threshold when a value of the C _ resel is equal to 0 includes: when the value of the same C _ resel is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset time duration, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, where the method includes: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers. In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, the carrier selection performed in the multiple carriers according to the filtered CBRs of the multiple carriers includes: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.

In a possible implementation manner, the method is performed by a terminal device, and the obtaining CBRs of candidate multiple carriers includes: and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

In a possible implementation manner, the method is performed by a terminal device, and the obtaining CBRs of candidate multiple carriers includes: and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.

In a possible implementation manner, the method is performed by a network device, and the obtaining CBRs of candidate multiple carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

In a possible implementation manner, the carrier selection process is not related to the resource holding probability ProbResourceKeep parameter.

In a possible implementation manner, the CBR of each carrier in the multiple carriers is a CBR of a resource pool used by the terminal device on each carrier.

In a possible implementation manner, the resource pool used by the terminal device on each carrier is a resource pool corresponding to an area where the terminal is located in a plurality of resource pools, where there is a correspondence between the plurality of resource pools and the plurality of areas.

In a second aspect, a method for carrier selection is provided, including: acquiring channel occupation ratios CBR of a plurality of candidate carriers; determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any carrier except the first carrier in the plurality of carriers; and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

Therefore, whether carrier selection is carried out or not is judged according to the difference between the CBR of the current carrier and the CBR of other carriers, and the carrier selection is carried out only when the difference between the CBR meets the condition, so that the frequency of carrier switching is reduced, and the stability of the system is ensured.

In one possible implementation manner, the determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold includes: when the value of the resource reselection counter C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In this embodiment, whether carrier selection is currently required is determined based on the resource reselection counter C _ resel, and when carrier selection is required, whether the difference between CBRs of the current carrier and other carriers meets the condition is determined, and when the difference between CBRs meets the condition, carrier selection is performed based on CBRs of different carriers, so that the carrier switching frequency is reduced, and the stability of the system is ensured.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and lasts for a preset time length, selecting carriers from the carriers according to the CBRs of the carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold and lasts for a preset duration, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the CBR is smaller than or equal to the second threshold value.

In one possible implementation, the method further includes: if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

if the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any carrier from the plurality of carriers as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used.

In one possible implementation manner, the determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold includes: when the value of C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In a possible implementation manner, each of the multiple carriers is configured with a corresponding C _ resel, where determining whether a difference between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold when a value of the C _ resel is equal to 0 includes: when the value of C _ resel corresponding to the carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In a possible implementation manner, the multiple carriers are configured with the same C _ resel, where the determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold when the value of C _ resel is equal to 0 includes: when the value of the same C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In a possible implementation manner, the performing carrier selection among the multiple carriers includes: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

In one possible implementation, the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by a network device, wherein the configuration information comprises the first threshold.

In one possible implementation, the method further includes: and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.

In a third aspect, a method for carrier selection is provided, including: acquiring channel occupation ratios CBR of a plurality of candidate carriers; and when the value of the resource reselection counter C _ resel is equal to 0, selecting the carriers from the multiple carriers according to the CBRs of the multiple carriers.

Therefore, the carrier selection process does not depend on the ProbResourceKeep parameter, and whether the carrier selection is required currently is determined based on the resource reselection counter C _ resel, so that effective carrier selection is realized, and the complexity of the system is reduced.

In a possible implementation manner, each carrier in the multiple carriers is configured with a corresponding C _ resel, where when a value of the C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers.

In a possible implementation manner, the multiple carriers are configured with the same C _ resel, where when the value of C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: and when the same value of the C _ resel is equal to 0, selecting the carrier in the plurality of carriers according to the CBRs of the plurality of carriers.

In one possible implementation, the method further includes: when the value of C _ resel is equal to 0, determining whether the CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

wherein the selecting carriers among the plurality of carriers according to the CBRs of the plurality of carriers includes: and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, the selecting a carrier from the multiple carriers according to the CBRs of the multiple carriers includes: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

In a fourth aspect, a method for carrier selection is provided, including: acquiring channel occupation ratios CBR of a plurality of candidate carriers; and when the position of the terminal equipment moves from the first area to the second area, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

Therefore, whether carrier selection is carried out or not is determined based on the position movement of the terminal equipment, and the carrier selection is carried out only when the geographical area where the terminal equipment is located changes, so that the frequency of carrier switching is reduced, and the stability of the system is ensured.

In a possible implementation manner, when the location of the terminal device moves from the first area to the second area, according to the CBRs of the multiple carriers, performing carrier selection in the multiple carriers includes:

when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

In this embodiment, when the geographical area where the terminal device is located changes, whether carrier selection is performed is determined according to the difference between the CBRs of the current carrier and other carriers, and carrier selection is performed when the CBR difference satisfies a condition, so that the carrier switching frequency is further reduced, and the stability of the system is ensured.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting the carriers from the carriers according to the CBRs of the carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and lasts for a preset time duration, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

In one possible implementation, the method further includes: when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

if the difference value between the CBR of the first carrier and the CBR of the second carrier after filtering does not exceed the first threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

In one possible implementation, the method further includes: filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including: and when the position of the terminal equipment moves from the first area to the second area, selecting the carriers in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In this embodiment, when the geographic area in which the terminal device is located changes, the filtering processing is performed on the measurement results of the CBRs of the multiple carriers, and based on the CBRs of the multiple carriers after the filtering processing, carrier selection is performed among the multiple carriers after filtering, so that carrier selection is realized while the frequency of carrier switching is reduced, and the stability of the system is ensured.

In one possible implementation manner, the CBR of each carrier of the multiple carriers after the smoothing filtering is: CBR _ new ═ a × CBR _ old + (1-a) × CBR _ current, where CBR _ new is the CBR of each carrier after filtering, CBR _ current is the CBR of each carrier before filtering, CBR _ old is the CBR of each carrier after filtering at the time of last carrier selection, and a is a filter coefficient and a is not less than 0 and not more than 1.

In a possible implementation manner, when the location of the terminal device moves from the first area to the second area, according to the CBRs of the multiple carriers, performing carrier selection in the multiple carriers includes: when the position of the terminal equipment moves from the first area to the second area, determining whether the CBR of a first carrier exceeds a third threshold value, wherein the first carrier is a carrier used for current data transmission; and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including: when the position of the terminal equipment moves from the first area to the second area, determining whether the CBR of a first carrier exceeds a third threshold value, wherein the first carrier is a carrier used for current data transmission; and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

In one possible implementation manner, the CBR of each carrier of the multiple carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including:

when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier;

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In this embodiment, when the geographical area in which the terminal device is located changes, whether carrier selection is performed is determined according to a difference between CBRs of the current carrier and other carriers, and when the CBR difference satisfies a condition, carrier selection is performed among the carriers by performing filtering processing on the measurement results of the CBRs of the carriers and based on the CBRs of the carriers after the filtering processing, so that carrier selection is achieved while the frequency of carrier switching is reduced, and the stability of the system is ensured.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset time, selecting carriers from the carriers according to the filtered CBRs of the carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers includes: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

In a possible implementation manner, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the filtered CBR is smaller than or equal to the second threshold value.

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including: when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier;

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

In a possible implementation manner, the selecting a carrier from the multiple carriers according to the CBRs of the multiple carriers includes: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.

In a fifth aspect, a method for carrier selection is provided, including: acquiring channel occupation ratios CBR of a plurality of candidate carriers; determining whether the CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission; and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

Therefore, the CBR of the current carrier is compared with the third threshold, and the carrier is selected when the CBR of the first carrier is larger than the third threshold, so that the frequency of carrier switching is reduced, and the stability of the system is ensured.

In one possible implementation, the method further includes: the terminal equipment acquires the third threshold value pre-configured in the terminal equipment; or, the terminal device receives configuration information sent by a network device, where the configuration information includes the third threshold.

In one possible implementation, the method further includes: and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the third threshold value.

A sixth aspect provides a communication device that may perform the operations of the communication device of the first aspect or any of the optional implementations of the first aspect. In particular, the communication device may comprise modular units for performing the operations in the first aspect described above or any possible implementation manner of the first aspect.

In a seventh aspect, a communication device is provided, which may perform the operations of the communication device in the second aspect or any optional implementation manner of the second aspect. In particular, the communication device may comprise modular units for performing the operations in the second aspect or any possible implementation of the second aspect.

In an eighth aspect, a communication device is provided, which may perform the operations of the communication device in the third aspect or any optional implementation manner of the third aspect. In particular, the communication device may comprise a module unit for performing the operations in the third aspect or any possible implementation manner of the third aspect.

A ninth aspect provides a communication device that can perform the operations of the communication device of the fourth aspect or any alternative implementation manner of the fourth aspect. In particular, the communication device may comprise modular units for performing the operations in the fourth aspect or any possible implementation manner of the fourth aspect.

A tenth aspect provides a communication device that can perform the operations of the communication device in the fifth aspect or any optional implementation manner of the fifth aspect. In particular, the communication device may comprise modular units for performing the operations in the fifth aspect or any possible implementation of the fifth aspect.

In an eleventh aspect, there is provided a communication apparatus including: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory are in communication with each other via an internal connection path. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the communication device to perform the method of the first aspect or any possible implementation manner of the first aspect, or the execution causes the communication device to implement the communication device provided by the sixth aspect.

In a twelfth aspect, there is provided a communication device comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory are in communication with each other via an internal connection path. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the communication device to perform the method of the second aspect or any possible implementation manner of the second aspect, or the execution causes the communication device to implement the communication device provided by the seventh aspect.

In a thirteenth aspect, there is provided a communication apparatus comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory are in communication with each other via an internal connection path. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the communication device to perform the method of the third aspect or any possible implementation manner of the third aspect, or the execution causes the communication device to implement the communication device provided by the eighth aspect.

In a fourteenth aspect, there is provided a communication device comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory are in communication with each other via an internal connection path. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the communication device to perform the method of the fourth aspect or any possible implementation manner of the fourth aspect, or the execution causes the communication device to implement the communication device provided by the ninth aspect.

In a fifteenth aspect, a communication device is provided, comprising: a processor, a transceiver, and a memory. Wherein the processor, the transceiver and the memory are in communication with each other via an internal connection path. The memory is configured to store instructions and the processor is configured to execute the instructions stored by the memory. When the processor executes the instructions stored by the memory, the execution causes the communication device to perform the method of the fifth aspect or any possible implementation manner of the fifth aspect, or the execution causes the communication device to implement the communication device provided by the tenth aspect.

In a sixteenth aspect, a computer-readable storage medium is provided, which stores a program that causes a communication device to execute the method for carrier selection of the first aspect and any of its various implementations.

A seventeenth aspect provides a computer-readable storage medium storing a program for causing a communication device to execute the method of carrier selection of the second aspect, and any of its various implementations.

In an eighteenth aspect, there is provided a computer-readable storage medium storing a program for causing a communication device to execute the method of carrier selection of the third aspect and any of its various implementations.

A nineteenth aspect provides a computer-readable storage medium storing a program that causes a communication device to execute the fourth aspect described above, and any one of its various implementations, a method of carrier selection.

A twentieth aspect provides a computer-readable storage medium storing a program for causing a communication device to execute the method of carrier selection of the fifth aspect described above and any of its various implementations.

In a twenty-first aspect, there is provided a chip comprising an input interface, an output interface, a processor and a memory, the processor being configured to execute instructions stored by the memory, and when executed, the processor being configured to implement the method of the foregoing first aspect or any possible implementation manner of the first aspect.

In a twenty-second aspect, there is provided a chip comprising an input interface, an output interface, a processor and a memory, the processor being configured to execute instructions stored by the memory, and when executed, the processor being configured to implement the method of the foregoing second aspect or any possible implementation manner of the second aspect.

In a twenty-third aspect, a chip is provided, where the chip includes an input interface, an output interface, a processor and a memory, where the processor is configured to execute instructions stored in the memory, and when the instructions are executed, the processor may implement the method in the foregoing third aspect or any possible implementation manner of the third aspect.

A twenty-fourth aspect provides a chip comprising an input interface, an output interface, a processor and a memory, the processor being configured to execute instructions stored by the memory, and when executed, the processor being configured to implement the method of any possible implementation of the foregoing fourth aspect or the fourth aspect.

In a twenty-fifth aspect, a chip is provided, which comprises an input interface, an output interface, a processor and a memory, wherein the processor is configured to execute instructions stored in the memory, and when the instructions are executed, the processor may implement the method in any possible implementation manner of the foregoing fifth aspect or fifth aspect.

A twenty-sixth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect or any possible implementation of the first aspect.

A twenty-seventh aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the second aspect or any possible implementation of the second aspect.

A twenty-eighth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the third aspect described above or any possible implementation of the third aspect.

A twenty-ninth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the fourth aspect or any possible implementation of the fourth aspect.

A thirty-first aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the fifth aspect or any possible implementation of the fifth aspect.

Drawings

Fig. 1 is a schematic architecture diagram of an application scenario according to an embodiment of the present application.

Fig. 2 is a schematic architecture diagram of another application scenario of an embodiment of the present application.

Fig. 3 is a schematic diagram of resource sensing and selection according to another embodiment of the present application.

Fig. 4 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application.

Fig. 5 is a schematic flow chart of a method of carrier selection according to another embodiment of the present application.

Fig. 6 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application.

Fig. 7 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application.

Fig. 8 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application.

Fig. 9 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device of another embodiment of the present application.

Fig. 11 is a schematic block diagram of a communication device according to yet another embodiment of the present application.

Fig. 12 is a schematic block diagram of a communication device of yet another embodiment of the present application.

Fig. 13 is a schematic block diagram of a communication device according to still another embodiment of the present application.

Fig. 14 is a schematic configuration diagram of a communication apparatus according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a chip of an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be understood that the technical solutions of the embodiments of the present application may be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a Long Term Evolution (Long Term Evolution) System, an LTE (Frequency Division Duplex) System, an LTE Time Division Duplex (FDD) System, a Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), and a future 5G Communication System.

Various embodiments are described herein in connection with a terminal device. A terminal device may also refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment. An access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G Network or a terminal device in a future evolved Public Land Mobile Network (PLMN) Network, etc.

Various embodiments are described herein in connection with a network device. The network device may be a device for communicating with the terminal device, and for example, may be a Base Transceiver Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB, or eNodeB) in an LTE system, or may be a relay Station, an access point, a vehicle-mounted device, a wearable device, and a network-side device in a future 5G network or a network-side device in a future evolved PLMN network.

Fig. 1 and 2 are schematic diagrams of an application scenario of the embodiment of the present application. Fig. 1 exemplarily shows one network device and two terminal devices, and optionally, the wireless communication system may include a plurality of network devices and each network device may include other numbers of terminal devices within the coverage area, which is not limited in this embodiment of the present invention. In addition, the wireless communication system may further include other Network entities such as a Mobile Management Entity (MME), a Serving Gateway (S-GW), a Packet Data Network Gateway (P-GW), and the like, but the embodiment of the present invention is not limited thereto.

Specifically, terminal device 20 and terminal device 30 may communicate in a cellular communication mode or D2D communication mode, in which the terminal device communicates with other terminal devices via a cellular link with a network device, for example, as shown in fig. 1, terminal device 20 and terminal device 30 may each communicate data with the network device; in the D2D communication mode, two terminal devices communicate directly through a D2D link, i.e., a Sidelink (SL) or a terminal direct link, for example, as shown in fig. 1 or fig. 2, the terminal device 20 and the terminal device 30 communicate directly through the Sidelink.

D2D communication may refer to Vehicle-to-Vehicle (V2V) communication or Vehicle-to-other device (V2X) communication. In V2X communication, X may refer to any device with wireless receiving and transmitting capability, such as but not limited to a slow moving wireless device, a fast moving vehicle-mounted device, or a network control node with wireless transmitting and receiving capability. It should be understood that the embodiment of the present invention is mainly applied to the scenario of V2X communication, but may also be applied to any other D2D communication scenario, and the embodiment of the present invention is not limited in this respect.

In the car networking system, there may be two types of terminal devices, namely, a terminal device with a listening capability such as a Vehicle User Equipment (VUE) or a Pedestrian hand-held terminal (PUE), and a terminal device without a listening capability such as a PUE. VUEs have higher processing capability and are generally powered by a storage battery in a vehicle, while PUE processing capability is lower, and reduction of power consumption is also a main factor to be considered by PUEs, so in the existing vehicle networking system, VUEs are considered to have complete receiving capability and listening capability; while PUEs are considered to have partial or no receiving and listening capabilities. If the PUE has partial interception capability, the resources can be selected by adopting an interception method similar to that of the VUE, and available resources can be selected on the intercepted resources; and if the PUE does not have the interception capability, the PUE randomly selects transmission resources in the resource pool.

Two transmission modes, transmission mode 3(mode 3) and transmission mode 4(mode 4), are defined in the 3GPP protocol. The transmission resource of the terminal equipment using the transmission mode 3 is allocated by the base station, and the terminal equipment transmits data on a sidelink according to the resource allocated by the base station; the base station may allocate resources for single transmission to the terminal device, or may allocate resources for semi-static transmission to the terminal device. The terminal device using transmission mode 4 transmits data in a listening (sensing) and reservation (reservation) manner. The terminal equipment acquires an available resource set in the resource pool in an intercepting mode, and randomly selects one resource from the available resource set for data transmission. Because the service in the car networking system has a periodic characteristic, the terminal device usually adopts a semi-static transmission mode, that is, after the terminal device selects one transmission resource, the resource is continuously used in a plurality of transmission cycles, so that the probability of resource reselection and resource conflict is reduced. The terminal device can carry the information of the reserved secondary transmission resource in the control information transmitted this time, so that other terminal devices can judge whether the resource is reserved and used by the terminal device by detecting the control information of the terminal device, and the purpose of reducing resource conflict is achieved.

When the terminal device performs resource listening, the resource listening may be specifically performed according to the method shown in fig. 3. In the 3GPP protocol of Release-14, in each sidelink process (sidelink process) (one carrier may include two processes), when a new data packet arrives at time n, resource selection needs to be performed, and the terminal device performs resource selection in a time period of [ n + T1, n + T2] ms according to a sensing result of a previous 1s (i.e. 1000ms) sensing window, where the time period of [ n + T1, n + T2] ms is referred to as a selection window, where T1 and T2 may satisfy T1 ≦ 4, and T2 ≦ 20 ≦ 100, for example. The first 1s mentioned later all refer to the first 1s for the time n. The specific resource selection process is as follows, and is described here by taking the terminal device 20 listening to the resources of the terminal device 30 as an example, and it is assumed that all the resources available for the terminal device 20 to transmit in the selection window are called a candidate resource set:

(1) if there are no listening results on certain subframes within the listening window, e.g. the terminal device 20 has its own data transmitted on these subframes, then the resources on these subframes at the corresponding positions within the selection window are excluded from the candidate resource set.

(2) If terminal device 20 detects that a Physical Sidelink Control Channel (PSCCH) sent by terminal device 30 is in the listening window of the first 1s, and a measured value of Reference Signal Received Power (RSRP) of a Physical Sidelink Shared Channel (PSCCH) corresponding to the PSCCH is higher than a preset threshold, and the detected PSCCH indicates that terminal device 30 sending the PSCCH reserves a time-frequency resource required for next transmission, terminal device 20 determines whether the time-frequency resource reserved by terminal device 30 in the selection window overlaps with a time-frequency resource selected by itself for data transmission in the selection window, and if the time-frequency resource overlaps, that is, a resource collision occurs, terminal device 20 excludes the time-frequency resource in the selection window from the candidate resource set.

It should be understood that if the terminal device 20 selects the time-frequency resource for transmitting data for itself within the selection window and needs to transmit data on a plurality of time-frequency resources distributed according to the time period T3, at this time, if the terminal device 30 reserves a plurality of time-frequency resources distributed according to the time period T2 and the time period T3 satisfies T3 × M — T2 × N, where M and N are positive integers, the terminal device 20 may exclude the plurality of time-frequency resources distributed according to the time period T3 from the candidate resource set.

(3) The terminal device 20 measures a Received Signal Strength Indicator (RSSI) of the remaining resources in the candidate resource set, and ranks the measurement results from high to low, and excludes resources with energy higher than a certain threshold from the candidate resource set, for example, the first 80% of the resources with high measurement power are excluded from the candidate resource set.

(4) The terminal device 20 randomly selects a time-frequency resource from the last remaining candidate resource set for data transmission.

It should be understood that, the time-frequency resource occupied by the data channel corresponding to a certain control channel is referred to as a time-frequency resource (or a resource block) for transmitting the data channel, and multiple time-frequency resources may exist in the candidate resource set in each selection window for transmitting the data channel. For example, the resources a1 and B1 in fig. 3 may both be referred to as a time-frequency resource.

When the terminal device 20 selects the time-frequency Resource for data transmission, the time-frequency Resource C _ delay is used in the subsequent transmission process, where C _ delay is a Resource Reselection Counter (Resource Reselection Counter), the value of C _ delay is decreased by 1 every time data is transmitted, when the value of C _ delay is decreased to 0, the terminal device 20 generates a random number between [0 and 1], and compares the random number with a Resource maintenance Probability (probabilityresource Keep) parameter, where the parameter represents a Probability that the terminal device continues to use the Resource, and if the value of the random number is greater than the parameter, the terminal device 20 performs Resource Reselection, and if the value of the random number is less than the parameter, the terminal device 20 may continue to use the time-frequency Resource for data transmission and simultaneously reset the value of C _ delay.

In the vehicle networking system supporting multi-carrier transmission, whether the terminal device uses the transmission mode 3 or the transmission mode 4, the terminal device can use one or more carriers in the candidate multiple carriers for current data transmission. A terminal device using transmission mode 4 may select one or more carriers among a plurality of candidate carriers for current data transmission, while a terminal device using transmission mode 3 may perform current data transmission according to the one or more carriers selected by the base station.

The terminal device may measure a congestion degree of the system, for example, measure a Channel Busy Ratio (CBR), and the base station may instruct the terminal device to report a measurement result to the base station, so that the base station configures transmission parameters, such as a Modulation Coding Mode (MCS) allowed by the terminal device, a number range of usable Physical resource blocks (PBRs), and transmission times of retransmission according to the CBR reported by the terminal device.

The CBR may be used for the terminal device to select carriers, for example, the terminal device may select a carrier with the lowest CBR for data transmission according to CBR measurement results of multiple carriers. However, the CBR of each carrier may change rapidly with the movement of the terminal device, or the CBR may change with the change of time, which may cause frequent switching among multiple carriers each time the terminal device performs carrier selection, thereby causing instability of the system.

In the carrier selection method provided by the embodiment of the present application, the terminal device or the network device may perform appropriate processing on the CBR and perform carrier selection based on the processed CBR, thereby achieving effective carrier selection and maintaining the stability of the system.

Fig. 4 is a schematic flow chart of a method for carrier selection according to an embodiment of the present application. The method shown in fig. 4 may be performed by a communication device comprising a terminal device, which may be, for example, terminal device 20 or terminal device 30 shown in fig. 2, or a network device, which may be, for example, network device 10 shown in fig. 1 or 2. In the following, a terminal device is taken as an example for description, but the method described in the present application may also be executed by a network device or the like. As shown in fig. 4, the carrier selection method includes:

in 410, channel occupancy ratios CBR of the candidate plurality of carriers are obtained.

At 420, the CBRs for the multiple carriers are filtered to obtain filtered CBRs for the multiple carriers.

At 430, carrier selection is performed among the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Specifically, the terminal device obtains CBRs of a plurality of carriers available for data transmission thereof, and performs filtering processing on candidate CBRs of the plurality of carriers to obtain filtered CBRs of the plurality of carriers. And then according to the filtered CBRs of the carriers, carrier selection is carried out in the carriers so as to select the carriers to be used. If the selected carrier to be used is the same as the carrier currently used by the terminal equipment, the carrier switching is not carried out, otherwise, the carrier switching is carried out.

Because the CBR of each carrier may change rapidly with the change of the location of the terminal device or change with the change of time, the CBR of each carrier changes smoothly by filtering the measured value of the CBR of each carrier, so that the carrier selection is realized while the carrier switching frequency is reduced, and the stability of the system is ensured.

The CBR of each carrier in the multiple carriers is a CBR of a resource pool used by the terminal device on each carrier.

Further, optionally, the resource pool used by the terminal device on each carrier is a resource pool corresponding to an area (i.e., a geographic area) where the terminal is located, in a plurality of resource pools, where there is a correspondence between the plurality of resource pools and the plurality of areas.

Specifically, a plurality of geographical areas may be divided, a corresponding relationship exists between the plurality of geographical areas and a plurality of resource pools, and a resource pool used when the terminal device transmits data on each carrier is a resource pool corresponding to a geographical area where the terminal device is currently located. When the terminal device uses the resource pool to perform data transmission with the network device, the CBR measured by the terminal device is the CBR of the resource pool, that is, the CBR measured by the terminal device is the CBR of the channel resource in the resource pool. The resource pool used in each carrier may also be different when the terminal device is in different geographical areas.

The correspondence between the plurality of geographic areas and the plurality of resource pools may be represented by a mapping table, a formula, and the like, for example, and the embodiment of the present application is not limited. Moreover, one geographic area may correspond to one or more resource pools, one resource pool may also correspond to one or more geographic areas, or the plurality of geographic areas and the plurality of resource pools may correspond one to one.

Optionally, if the method is performed by a terminal device, then in 410, acquiring CBRs of candidate multiple carriers includes: the terminal device measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

For example, the terminal device measures the CBRs of the multiple carriers and reports the measured CBRs to the upper layer, and the upper layer performs filtering processing on the CBRs of the multiple carriers reported by the lower layer. And the terminal equipment selects the carriers according to the filtered CBRs of the carriers.

Or, optionally, the method is executed by a terminal device, and then in 410, acquiring CBRs of a plurality of candidate carriers includes: the terminal device receives a broadcast message sent by the network device, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, if the method is performed by a network device, then in 410, acquiring CBRs of candidate multiple carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

For example, the network device may instruct the terminal device to measure the CBR of each carrier and report the measurement result to the network device.

Optionally, in 420, performing filtering processing on the CBRs of the multiple carriers includes: the CBRs for the multiple carriers are smoothed.

The embodiment of the present application does not limit the smoothing filtering method.

For example, the smoothing filtering may be performed in a manner of CBR _ new ═ a × CBR _ old + (1-a) × CBR _ current.

The carrier wave selection method comprises the steps of filtering carriers, wherein CBR _ new is CBR of each filtered carrier wave, CBR _ current is CBR of each carrier wave before filtering, CBR _ old is CBR of each filtered carrier wave when the last carrier wave is selected, a is a filter coefficient, and a is more than or equal to 0 and less than or equal to 1.

It can be seen that since the CBR obtained by measurement is filtered by using a proper filtering method, frequent carrier switching caused by CBR speed change is avoided.

Optionally, in 430, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used according to the filtered CBRs of the plurality of carriers.

Based on the above carrier selection method, the embodiments of the present application further provide five specific methods for carrier selection by a terminal device or a network device, and the following description will take the terminal device as an example.

Mode 1

Optionally, before 430, that is, before performing carrier selection among the multiple carriers according to the filtered CBRs of the multiple carriers, the method further includes: determining whether a difference between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier.

In 430, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, when the method is executed by the terminal device, before determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold, the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by the network device, wherein the configuration information comprises the first threshold.

Optionally, when the method is executed by a network device, the method further includes: the network device sends configuration information to the terminal device, wherein the configuration information comprises the first threshold value.

For example, the number of candidate multiple carriers is N, where N is a positive integer greater than or equal to 2. The CBR measurements for each of the N carriers are denoted CBR1, BCR2, … …, CBRN, respectively. Assuming that the CBR of the carrier used by the current terminal device is CBR1, for any CBRk of N CBRs, if | CBR1-CBRk | > B is satisfied and B is a preset threshold, the terminal device is triggered to select the carrier, for example, the terminal device measures and filters the CBRs of N carriers, and selects the carrier with the minimum CBR from the N carriers as the carrier to be used according to the filtered CBRs of the N carriers. The first threshold B here may be pre-configured in the terminal device or network device, e.g. agreed in a protocol; the network device may also indicate the first threshold B to the terminal device via configuration information.

Further, optionally, in 430, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the plurality of filtered carriers exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

That is, when the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, those carriers whose CBR satisfies a condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold may be selected among the plurality of carriers, and the carrier to be used may be selected among the carriers whose CBR satisfies the condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold.

Optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Further, optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset duration, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

That is, the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold for the preset duration, and those carriers whose CBR satisfies a condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold may be selected among the plurality of carriers, and the carrier to be used may be selected among the carriers whose CBR satisfies the condition.

Optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Or, optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

Another situation exists, where a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, and optionally, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, where the method includes:

Mode 2

Optionally, in 430, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and when the value of the resource reselection counter C _ resel is equal to 0, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where when the value of the C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: when the value of C _ resel corresponding to the carrier (first carrier) used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers.

In other words, the terminal device may configure independent C _ resel for the HARQ process on each carrier, and when a value of C _ resel corresponding to a carrier (a first carrier) used for current data transmission is equal to 0, the terminal device may be triggered to perform carrier selection.

Or, optionally, the same C _ resel is configured on the multiple carriers, where when the value of the C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: when the same value of C _ resel is equal to 0, carrier selection is performed among the plurality of carriers according to CBRs of the plurality of carriers.

That is, the terminal device may configure the same C _ resel for the HARQ of the multiple carriers, and trigger the terminal device to perform carrier selection when the C _ resel is equal to 0.

Mode 3

Optionally, before 430, that is, before performing carrier selection among the multiple carriers according to the filtered CBRs of the multiple carriers, the method further includes: when the value of C _ resel is equal to 0, determining whether a difference between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, where the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

In this embodiment, whether carrier selection is currently required is determined based on the resource C _ resel, whether the difference between CBRs of the current carrier and other carriers meets the condition is determined when carrier selection is required, and carrier selection is performed based on the CBRs after filtering when the difference between CBRs meets the condition, so that the carrier switching frequency is further reduced, and the stability of the system is ensured.

Specifically, when the value of C _ resel is equal to 0, the terminal device is triggered to determine the CBR difference, and when the CBR difference between the first filtered carrier and the second filtered carrier exceeds a first threshold, the terminal device selects a carrier from the candidate carriers.

Optionally, in 430, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for the preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

That is, the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold for the preset duration, and those carriers whose CBR satisfies a condition that the difference between the filtered CBR of the carriers and the filtered CBR of the first carrier exceeds the first threshold may be selected among the plurality of carriers, and the carrier to be used may be selected among the carriers whose CBR satisfies the condition.

Optionally, in 430, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

Optionally, the method is performed by the terminal device, and before determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold, the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by the network device, wherein the configuration information comprises the first threshold.

Optionally, the method is performed by a network device, and the method further includes: the network device sends configuration information to the terminal device, wherein the configuration information comprises the first threshold value.

Optionally, configuring a corresponding C _ resel on each of the multiple carriers, where when the value of the C _ resel is equal to 0, determining whether a difference between the CBR of the first filtered carrier and the CBR of the second filtered carrier exceeds a first threshold includes: when the value of C _ resel corresponding to the carrier (first carrier) used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

Optionally, configuring the same C _ resel on the multiple carriers, where when the value of the C _ resel is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold includes: when the value of the same C _ resel is equal to 0, it is determined whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

Mode 4

Optionally, the method further comprises: and determining whether the CBR of the filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission.

In 430, the carrier selection performed in the multiple carriers according to the filtered CBRs of the multiple carriers includes: and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the filtered CBR of the plurality of carriers.

Optionally, when the CBR of the first carrier does not exceed the third threshold, carrier selection may not be performed, and the first carrier may still be used.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

In the embodiment, the filtering processing is performed on the measurement results of the CBRs of the multiple carriers, whether the carrier selection is performed is judged according to whether the CBR of the filtered current carrier exceeds the preset threshold, and when the CBR of the filtered current carrier is greater than the threshold, the carrier selection is performed in the multiple carriers, so that the carrier selection is realized, the carrier switching frequency is further reduced, and the stability of the system is ensured.

Mode 5

Optionally, the method further comprises: when the value of C _ resel is equal to 0, it is determined whether the CBR of the filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

In this embodiment, the carrier selection process does not depend on the ProbResourceKeep parameter, but is based on the resource reselection counter C _ resel, and when C _ resel is 0, the terminal device is triggered to perform carrier selection, so that the measurement results of CBRs of multiple carriers are filtered, and whether carrier selection is performed is determined according to whether the CBR of the filtered current carrier exceeds a preset threshold, and when the CBR of the filtered current carrier is greater than the threshold, carrier selection is performed, so that while effective carrier selection is achieved, the complexity of the system is reduced.

Optionally, the method is performed by a terminal device, and the method further includes: the terminal device acquires the third threshold value pre-configured in the terminal device; or, the terminal device receives configuration information sent by the network device, where the configuration information includes the third threshold.

Optionally, the method is performed by a network device, and the method further includes: the network device sends configuration information to the terminal device, wherein the configuration information comprises the third threshold value.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where when the value of the C _ resel is equal to 0, determining whether the CBR of the filtered first carrier exceeds a third threshold includes: when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the filtered CBR of the first carrier exceeds the third threshold.

Optionally, the configuring the same C _ resel on the multiple carriers, where when a value of the C _ resel is equal to 0, determining whether the CBR of the filtered first carrier exceeds a third threshold includes: when the value of the same C _ resel is equal to 0, it is determined whether the filtered CBR of the first carrier exceeds the third threshold.

It should be understood that the method for selecting carriers in the embodiment of the present application may be applied to terminal devices using different transmission modes (e.g., the aforementioned transmission mode 3 or transmission mode 4). When the terminal device uses the transmission mode 3, the network device can select the carrier based on the method and inform the terminal device; when the terminal device uses transmission mode 4, the terminal device can autonomously perform carrier selection by the above-described method. The detailed process of the network device for carrier selection may refer to the process of the terminal device for carrier selection, and is not described herein again for brevity.

Fig. 5 is a schematic flow chart of a method of carrier selection according to another embodiment of the present application. The method shown in fig. 5 may be performed by a communication device comprising a terminal device, which may be, for example, terminal device 20 or terminal device 30 shown in fig. 2, or a network device, which may be, for example, network device 10 shown in fig. 1 or 2. In the following, a terminal device is taken as an example for description, but the method described in the present application may also be executed by a network device or the like. As shown in fig. 5, the carrier selection method includes:

at 510, acquiring candidate CBRs of a plurality of carriers;

at 520, it is determined whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold.

Wherein, the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

at 530, carrier selection is performed among the plurality of carriers if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold.

Specifically, the terminal device obtains measurement results of CBRs of a plurality of candidate carriers, calculates a difference between the CBR of a first carrier used for current data transmission and CBRs of other carriers, and when the difference between the CBR of the first carrier and the CBR of any one of the other carriers is greater than a first threshold, triggers the terminal device to select the carrier, and when selecting the carrier, the terminal device can select the carrier to be used from the plurality of carriers according to the CBRs of the plurality of carriers. If the selected carrier to be used is the same as the carrier currently used by the terminal equipment, the carrier switching is not carried out, otherwise, the carrier switching is carried out.

For example, the number of candidate multiple carriers is N, where N is a positive integer greater than or equal to 2. The CBR measurements for each of the N carriers are denoted CBR1, BCR2, … …, CBRN, respectively. Assuming that the CBR of the carrier used by the current terminal device is CBR1, for any CBRk of N CBRs, if the CBR1-CBRk | is greater than B and B is a preset threshold, the terminal device is triggered to select the carrier, for example, the terminal device measures the CBRs of N carriers, and selects the carrier with the minimum CBR from the N carriers as the carrier to be used according to the obtained CBRs of the N carriers.

Further, optionally, in 530, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the multiple carriers according to the CBRs of the multiple carriers, including:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

That is, when the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, those carriers whose CBR satisfies a condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold may be selected among the plurality of carriers, and the carrier to be used may be selected among the carriers whose CBR satisfies the condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold.

Optionally, the resource pool used by the terminal device on each carrier is a resource pool corresponding to an area (i.e., a geographic area) where the terminal is located, where the resource pools and the areas have correspondence.

Optionally, when the method is executed by a terminal device, in 510, acquiring CBRs of a plurality of candidate carriers includes: the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, when the method is executed by a terminal device, in 510, acquiring CBRs of a plurality of candidate carriers includes: the terminal device receives a broadcast message sent by the network device, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, when the method is performed by the terminal device, before 520, that is, before determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by the network device, wherein the configuration information comprises the first threshold.

Optionally, when the method is executed by a network device, in 510, acquiring CBRs of a plurality of candidate carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

Optionally, in 520, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises: when the value of C _ resel is equal to 0, it is determined whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In this embodiment, the carrier selection process is independent of the probresourcekep parameter. The terminal equipment determines whether carrier selection is needed currently or not based on C _ resel, judges whether the difference between the CBRs of the current carrier and other carriers meets the condition or not when the carrier selection is needed, and selects the carrier based on the CBRs of different carriers when the difference between the CBRs meets the condition, so that the carrier switching frequency is reduced, and the stability of the system is ensured.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where when a value of the C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold includes: when a value of C _ resel corresponding to a carrier (a first carrier) used for current data transmission among a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

In other words, the terminal device may configure an independent C _ resel for the HARQ process on each carrier, and when the C _ resel corresponding to any one of the carriers is 0, the terminal device may be triggered to perform carrier selection.

Optionally, the same C _ resel is configured on the multiple carriers, wherein when the value of C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold includes: when the value of the same C _ resel is equal to 0, it is determined whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

Optionally, in 530, if a difference between the CBR of the one carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the plurality of carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers.

Further, optionally, in 530, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold for a preset duration, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers, including: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the CBRs of the plurality of carriers.

That is, the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold for the predetermined duration, and the carriers whose CBR satisfies the condition that the difference between the CBR of the carriers and the CBR of the first carrier exceeds the first threshold may be selected from the plurality of carriers, and the carriers to be used may be selected from the carriers whose CBR satisfies the condition.

Optionally, in 530, if a difference between the CBR of the one carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the plurality of carriers includes: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers.

Or, optionally, in 530, if a difference between the CBR of the one carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the multiple carriers, including:

if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is less than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

There is another case that a difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, and optionally, performing carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers includes:

if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold value, selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used.

Optionally, in 530, carrier selection is performed among the multiple carriers, including: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

When the terminal device uses the transmission mode 3, the network device can select the carrier based on the method and inform the terminal device; when the terminal device uses transmission mode 4, the terminal device can autonomously perform carrier selection by the above-described method. The detailed process of the network device for carrier selection may refer to the process of the terminal device for carrier selection, and is not described herein again for brevity.

Fig. 6 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application. The method shown in fig. 6 may be performed by a communication device comprising a terminal device, which may be, for example, terminal device 20 or terminal device 30 shown in fig. 2, or a network device, which may be, for example, network device 10 shown in fig. 1 or 2. In the following, a terminal device is taken as an example for description, but the method described in the present application may also be executed by a network device or the like. As shown in fig. 6, the method for carrier selection includes:

at 610, CBRs for a plurality of candidate carriers are obtained;

at 620, when the value of the resource reselection counter C _ resel is equal to 0, carrier selection is performed among the plurality of carriers according to CBRs of the plurality of carriers.

Therefore, the carrier selection process does not depend on the ProbResourceKeep parameter, but determines whether the carrier selection is currently required based on the resource reselection counter C _ resel, that is, the terminal device is triggered to select the carrier when C _ resel is 0, thereby realizing effective carrier selection and reducing the complexity of the system.

Optionally, when the method is executed by a terminal device, in 610, acquiring CBRs of a plurality of candidate carriers includes: the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Specifically, the terminal device may calculate CBRs of the candidate multiple carriers when the value of C _ resel is equal to 0, and perform carrier selection among the multiple carriers according to the CBRs of the multiple carriers.

Optionally, the method is performed by a terminal device, and in 610, acquiring CBRs of a plurality of candidate carriers includes: the terminal device receives a broadcast message sent by the network device, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, when the method is executed by a network device, in 610, acquiring CBRs of a plurality of candidate carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

Specifically, when the value of C _ resel is equal to 0, the network device may select a carrier from the multiple carriers according to the CBRs of the multiple carriers reported by the terminal device.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel. At this time, in 620, when the value of C _ resel is equal to 0, carrier selection is performed among the multiple carriers according to CBRs of the multiple carriers, including: when the value of C _ resel corresponding to the carrier (first carrier) used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers.

Optionally, the same C _ resel is configured on the multiple carriers. At this time, in 620, when the value of C _ resel is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers, including: when the same value of C _ resel is equal to 0, carrier selection is performed among the plurality of carriers according to CBRs of the plurality of carriers.

That is to say, in a plurality of candidate carriers, an HARQ process on each carrier may be configured with an independent resource reselection counter C _ resel, and when a value of C _ resel corresponding to a carrier (a first carrier) used for current data transmission is equal to 0, the terminal device is triggered to perform carrier selection; or, the HARQ processes of all carriers are configured with the same C _ resel, and when the C _ resel is equal to 0, the terminal device is triggered to perform carrier selection.

Optionally, in 620, according to the CBRs of the multiple carriers, carrier selection is performed in the multiple carriers, including: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the method further comprises: when the value of C _ resel is equal to 0, it is determined whether the CBR of the first carrier, which is a carrier used for current data transmission, exceeds a third threshold.

In 620, carrier selection is performed among the multiple carriers according to the CBRs of the multiple carriers, including: if the CBR of the first carrier exceeds the third threshold, carrier selection is performed among the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

Therefore, the process of carrier selection does not depend on the ProbResourceKeep parameter, but is based on the resource reselection counter C _ resel, and when C _ resel is 0, the terminal device is triggered to perform carrier selection, so that whether carrier selection is performed or not is judged according to whether the CBR of the current carrier exceeds a preset threshold, and when the CBR of the current carrier is greater than the threshold, carrier selection is performed, so that while effective carrier selection is achieved, the complexity of the system is reduced.

When the terminal device uses the transmission mode 3, the network device can select the carrier based on the method and inform the terminal device; when the terminal device uses transmission mode 4, the terminal device can autonomously perform carrier selection by the above-described method. For the details of the process of selecting the carrier by the network device, reference may be made to the foregoing description of the terminal device, and for brevity, details are not repeated here.

Fig. 7 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application. The method shown in fig. 7 may be performed by a communication device comprising a terminal device, which may be, for example, terminal device 20 or terminal device 30 shown in fig. 2, or a network device, which may be, for example, network device 10 shown in fig. 1 or 2. In the following, a terminal device is taken as an example for description, but the method described in the present application may also be executed by a network device or the like. As shown in fig. 7, the method for carrier selection includes:

at 710, CBRs for candidate multiple carriers are obtained.

At 720, when the location of the terminal device moves from the first area to the second area, carrier selection is performed among the plurality of carriers according to CBRs of the plurality of carriers.

Optionally, the CBR of each carrier in the multiple carriers is a CBR of a resource pool used by the terminal device on each carrier.

For example, the network device may divide the entire geographic area into a plurality of areas, configure a corresponding resource pool for each area, and perform data transmission by using the resource pool corresponding to the area where the terminal device is located. The different zones have respective zone identifications (zone _ id), and the zone _ id of each zone can be calculated by the following formula:

x ₁＝Floor(x/L)Mod Nx；

y ₁＝Floor(y/W)Mod Ny；

zone_id＝y1×Nx+x1；

wherein L is the length of each region, W is the width of each region, Nx is the total number of regions in the longitudinal direction, Ny is the total number of regions in the latitudinal direction, x is the distance (in meters) in the longitudinal direction of the current position of the terminal device relative to the position (0,0), y is the distance (in meters) in the latitudinal direction of the current position of the terminal device relative to the position (0,0), Floor is rounding-down, Mod is the remainder.

Because the CBR of each carrier may change rapidly with the change of the location of the terminal device or change with the change of time, whether to select the carrier is determined based on the location movement of the terminal device, and the carrier selection is performed only when the geographical area where the terminal device is located changes, thereby reducing the frequency of carrier switching and ensuring the stability of the system.

Optionally, if the method is performed by a terminal device, then in 610, acquiring CBRs of candidate multiple carriers includes: the terminal device measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, if the method is performed by a terminal device, then in 610, acquiring CBRs of candidate multiple carriers includes: the terminal device receives a broadcast message sent by the network device, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, if the method is performed by a network device, then in 610, acquiring CBRs of candidate multiple carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

Optionally, in 720, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Based on the above description, the embodiments of the present application further provide five specific methods that can be used for the terminal device or the network device to select the carrier, and the following description takes the terminal device as an example.

Mode 1

Optionally, in 720, when the location of the terminal device moves from the first area to the second area, according to the CBRs of the multiple carriers, performing carrier selection in the multiple carriers, including:

if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, carrier selection is performed among the carriers according to the CBRs of the carriers.

Further, optionally, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers, including:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, selecting one carrier as the carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

Optionally, when the method is executed by the terminal device, before determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, the method further includes: the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or the terminal device receives configuration information sent by the network device, wherein the configuration information comprises the first threshold.

For example, the number of candidate multiple carriers is N, where N is a positive integer greater than or equal to 2. The CBR measurements for each of the N carriers are denoted CBR1, BCR2, … …, CBRN, respectively. Assuming that the CBR of the carrier used by the current terminal device is CBR1, if the terminal device moves from the first area to the second area, and if the CBR of any one of the N CBRs satisfies | CBR1-CBRk | > B and B is a preset threshold, the terminal device is triggered to select the carrier, for example, the terminal device measures the CBRs of the N carriers, and selects the carrier with the minimum CBR from the N carriers as the carrier to be used according to the obtained CBRs of the N carriers.

Optionally, in 720, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the multiple carriers according to the CBRs of the multiple carriers, including: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the carriers according to the CBRs of the carriers.

That is, when the terminal device moves from the first area to the second area, if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and lasts for a predetermined duration, then carrier selection is performed, for example, the carrier with the smallest CBR is selected as the carrier to be used.

Further, optionally, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and lasts for a preset time duration, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers, including: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

Optionally, in 720, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold, performing carrier selection among the multiple carriers according to the CBRs of the multiple carriers, including: and if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and the CBR of the first carrier is greater than a second threshold, carrying out carrier selection in the carriers according to the CBRs of the carriers.

That is, when the terminal device moves from the first area to the second area, if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold and the CBR of the first carrier is greater than the second threshold, carrier selection is performed, for example, the carrier with the smallest CBR is selected as the carrier to be used.

Or, optionally, in 720, if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers, including:

if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is less than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or

There is another case that when the location of the terminal device moves from the first area to the second area, the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, and optionally, the method further includes:

if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; or

If the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any carrier from the plurality of carriers as a carrier to be used; or

Mode 2

Optionally, before 720, that is, before carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, the method further includes: filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

in 720, carrier selection is performed among the multiple carriers according to the CBRs of the multiple carriers, including: and according to the filtered CBRs of the multiple carriers, carrying out carrier selection in the multiple carriers.

Optionally, the filtering the CBRs of the multiple carriers includes: the CBRs for the multiple carriers are smoothed.

Optionally, in 720, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used according to the filtered CBRs of the plurality of carriers.

Mode 3

in 720, when the location of the terminal device moves from the first area to the second area, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including:

when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

In this embodiment, when the geographical area in which the terminal device is located changes, whether carrier selection is performed is determined according to a difference between CBRs of the current carrier and other carriers, and when the CBR difference satisfies a condition, carrier selection is performed among the carriers by performing filtering processing on the measurement results of the CBRs of the multiple carriers and based on the CBRs of the multiple carriers after the filtering processing, so that carrier selection is achieved while the carrier switching frequency is further reduced, and the stability of the system is ensured.

Further, optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

The filtering method in the embodiment of the present application is not limited, and for example, the CBRs of the multiple carriers may be smoothly filtered.

Optionally, the CBR of each carrier of the plurality of carriers after performing the smoothing filtering may be: CBR _ new ═ a × CBR _ old + (1-a) × CBR _ current,

Optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

That is, when the terminal device moves from the first area to the second area, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset time duration, carrier selection is performed based on the filtered CBRs of the multiple carriers, for example, a carrier with the smallest filtered CBR is selected as a carrier to be used.

Further, optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and lasts for a preset duration, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

Optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold, performing carrier selection in the multiple carriers according to the CBRs of the multiple carriers, including: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

That is, when the terminal device moves from the first area to the second area, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold and the filtered CBR of the first carrier is greater than the second threshold, then carrier selection is performed based on the filtered CBRs of the multiple carriers, for example, the carrier with the smallest filtered CBR is selected as the carrier to be used.

Further, optionally, if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection in the multiple carriers according to the filtered CBRs of the multiple carriers, including:

Another situation exists, that is, a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, where optionally, when the location of the terminal device moves from the first area to the second area, carrier selection is performed in the multiple carriers according to the CBRs of the multiple carriers, including:

when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier;

Mode 4

Optionally, in 720, when the location of the terminal device moves from the first area to the second area, according to the CBRs of the multiple carriers, performing carrier selection in the multiple carriers, including: when the position of the terminal equipment moves from the first area to the second area, determining whether the CBR of a first carrier exceeds a third threshold value, wherein the first carrier is a carrier used for current data transmission; if the CBR of the first carrier exceeds the third threshold, carrier selection is performed among the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

In the embodiment, when the geographical area where the terminal device is located changes, whether carrier selection is performed is judged according to whether the CBR of the current carrier exceeds the preset threshold, and when the CBR of the current carrier is greater than the threshold, carrier selection is performed among a plurality of candidate carriers, so that carrier selection is realized while the carrier switching frequency is further reduced, and the stability of the system is ensured.

Mode 5

Optionally, the method further comprises: and filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers.

In 720, when the location of the terminal device moves from the first area to the second area, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including: when the position of the terminal equipment moves from the first area to the second area, determining whether the CBR of the filtered first carrier exceeds a third threshold value, wherein the first carrier is a carrier used for current data transmission; and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

Optionally, the CBR of each of the plurality of carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

In this embodiment, when the geographic area in which the terminal device is located changes, filtering is performed on the measurement results of the CBRs of the multiple carriers, whether carrier selection is performed is determined according to whether the CBR of the filtered current carrier exceeds a preset threshold, and when the CBR of the filtered current carrier is greater than the threshold, carrier selection is performed, so that while effective carrier selection is achieved, the complexity of the system is reduced.

Fig. 8 is a schematic flow chart of a method of carrier selection according to still another embodiment of the present application. The method shown in fig. 8 may be performed by a communication device comprising a terminal device, which may be, for example, terminal device 20 or terminal device 30 shown in fig. 2, or a network device, which may be, for example, network device 10 shown in fig. 1 or 2. In the following, a terminal device is taken as an example for description, but the method described in the present application may also be executed by a network device or the like. As shown in fig. 8, the method for carrier selection includes:

at 810, CBRs for candidate multiple carriers are obtained.

At 820, it is determined whether the CBR of the first carrier, which is the carrier used for the current data transmission, exceeds a third threshold.

At 830, carrier selection is performed among the plurality of carriers according to the CBRs of the plurality of carriers if the CBR of the first carrier exceeds the third threshold.

Specifically, the terminal device obtains measurement results of CBRs of the candidate multiple carriers, calculates the CBR of the first carrier used for current data transmission, and when the CBR of the first carrier is greater than a third threshold, triggers the terminal device to perform carrier selection, and during carrier selection, the terminal device may select a carrier to be used from the multiple carriers according to the CBRs of the multiple carriers. When carrier selection is performed, carrier selection may be performed among a plurality of carriers including the first carrier, or may also be performed among a plurality of carriers not including the first carrier.

Optionally, the candidate multiple carriers include the first carrier.

Optionally, the candidate multiple carriers do not include the first carrier.

Therefore, the CBR of the current carrier is compared with the third threshold, and the carrier is selected when the CBR of the first carrier is greater than the third threshold, so that the frequency of carrier switching is reduced, and the stability of the system is ensured.

For example, the CBR of the carrier used by the current terminal device is CBR1, and if CBR1 is greater than the third threshold, the terminal device is triggered to select a carrier, for example, the terminal device measures CBRs of a plurality of candidate carriers, and selects a carrier with the minimum CBR from the plurality of carriers as a carrier to be used according to the obtained CBRs of the plurality of carriers, where the plurality of candidate carriers may include the first carrier, or may not include the first carrier.

Optionally, in 830, carrier selection is performed among the multiple carriers, including: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the method is performed by a terminal device, and the obtaining CBRs of the candidate multiple carriers includes: the terminal device measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the method is performed by a terminal device, and the obtaining CBRs of the candidate multiple carriers includes: the terminal device receives a broadcast message sent by the network device, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the method further comprises: the terminal device acquires the third threshold value pre-configured in the terminal device; or, the terminal device receives configuration information sent by the network device, where the configuration information includes the third threshold.

Optionally, the method is performed by a network device, and the obtaining CBRs of the candidate multiple carriers includes: and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.

Optionally, the method further comprises: the network device sends configuration information to the terminal device, wherein the configuration information comprises the third threshold value.

Optionally, the resource pool used by the terminal device on each carrier is a resource pool corresponding to an area where the terminal is located in a plurality of resource pools, where there is a correspondence between the plurality of resource pools and the plurality of areas.

It should be understood that the descriptions of the methods 400-800 may be referred to each other, and the methods in the embodiments of the methods 400-800 may be combined for use, and therefore, for brevity, are not described again.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for carrier selection according to the embodiment of the present application is described above in detail, and an apparatus according to the embodiment of the present application will be described below with reference to fig. 9 to 15, and the technical features described in the method embodiment are applicable to the following apparatus embodiments.

Fig. 9 is a schematic block diagram of a communication device 900 according to an embodiment of the present application. As shown in fig. 9, the communication device 900 includes an obtaining unit 910, a filtering unit 920, and a carrier selecting unit 930. Wherein:

an obtaining unit 910, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

a filtering unit 920, configured to perform filtering processing on the CBRs of the multiple carriers acquired by the acquiring unit 910 to obtain filtered CBRs of the multiple carriers;

a carrier selecting unit 930, configured to perform carrier selection in the multiple carriers according to the CBRs of the multiple carriers filtered by the filtering unit 920.

Optionally, the filtering unit 920 is specifically configured to: and performing smooth filtering on the CBRs of the multiple carriers.

Optionally, the CBR of each of the plurality of carriers after the smoothing filtering is: CBR _ new ═ a × CBR _ old + (1-a) × CBR _ current, where CBR _ new is the CBR of each carrier after filtering, CBR _ current is the CBR of each carrier before filtering, CBR _ old is the CBR of each carrier after filtering at the time of last carrier selection, and a is a filter coefficient and a is not less than 0 and not more than 1.

Optionally, the communication device further includes a determining unit configured to: determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

the carrier selecting unit 930 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 930 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, the terminal device includes a transceiver unit, where the obtaining unit 910 is further configured to: acquiring the first threshold value pre-configured in the terminal equipment; or receiving configuration information sent by a network device through the transceiver unit, where the configuration information includes the first threshold.

Optionally, the communication device is a network device, and the network device includes a transceiver unit, where the transceiver unit is configured to: and sending configuration information to the terminal equipment, wherein the configuration information comprises the first threshold value.

Optionally, the carrier selecting unit 930 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 930 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

Optionally, the carrier selecting unit 930 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 930 is specifically configured to: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, and the filtered CBR of the first carrier is less than or equal to a second threshold, performing carrier selection on carriers whose CBR is less than or equal to the second threshold after filtering.

Optionally, the communication device further comprises a determining unit, configured to: determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selecting unit is specifically configured to: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

Optionally, the carrier selecting unit 930 is specifically configured to: and when the value of the resource reselection counter C _ resel is equal to 0, selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where the carrier selecting unit 930 is specifically configured to: and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, the same C _ resel is configured on the multiple carriers, where the carrier selecting unit 930 is specifically configured to: and when the same value of C _ resel is equal to 0, selecting carriers from the multiple carriers according to the filtered CBRs of the multiple carriers.

Optionally, the communication device further includes a determining unit, where the determining unit is specifically configured to: when the value of C _ resel is equal to 0, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where the determining unit is specifically configured to: when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

Optionally, the same C _ resel is configured on the multiple carriers, wherein the determining unit is specifically configured to: when the value of the same C _ resel is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

optionally, the carrier selecting unit 930 is specifically configured to: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

Optionally, the carrier selecting unit 930 is specifically configured to: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 910 is specifically configured to: and measuring the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, the terminal device further includes a transceiver unit, wherein the obtaining unit 910 is specifically configured to: and receiving a broadcast message sent by the network equipment through the transceiver unit, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the communication device is a network device, and the obtaining unit 910 is specifically configured to: and receiving the CBRs of the multiple carriers reported by the terminal equipment through a transceiving unit.

Optionally, the carrier selection process is not related to the resource holding probability ProbResourceKeep parameter.

It should be understood that the communication device 900 may perform the corresponding operations of the method 400 performed by the communication device in the above method embodiments, and therefore, for brevity, the description is not repeated herein.

Fig. 10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. As shown in fig. 10, the communication device 1000 includes an acquisition unit 1010, a determination unit 1020, and a carrier selection unit 1030. Wherein:

an obtaining unit 1010, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

a determining unit 1020, configured to determine whether a difference between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold, where the first carrier is a carrier used for current data transmission, and the second carrier is any one of the multiple carriers except the first carrier;

a carrier selecting unit 1030, configured to select a carrier from the multiple carriers acquired by the acquiring unit 1010 when a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold.

Therefore, whether carrier selection is carried out or not is determined by judging the difference between the CBRs of the current carrier and other carriers, and the carrier selection is carried out only when the difference between the CBRs meets the condition, so that the frequency of carrier switching is reduced, and the stability of the system is ensured.

Optionally, the carrier selecting unit 1030 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1030 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and lasts for a preset time length, selecting carriers from the carriers according to the CBRs of the carriers.

Optionally, the carrier selecting unit 1030 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1030 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1030 is specifically configured to: if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

Optionally, the carrier selecting unit 1030 is further configured to: if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; or, if the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any one carrier from the plurality of carriers as a carrier to be used; or, if the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum CBR after filtering from the multiple carriers as the carrier to be used.

Optionally, the determining unit 1020 is specifically configured to: when the value of the resource reselection counter C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where the determining unit 1020 is specifically configured to: when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

Optionally, the same C _ resel is configured on the multiple carriers, where the determining unit 1020 is specifically configured to: when the value of the same C _ resel is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.

Optionally, the carrier selecting unit 1030 is specifically configured to: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 1010 is specifically configured to: measuring the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, the terminal device includes a transceiver unit, and the obtaining unit 1010 is specifically configured to: and receiving a broadcast message sent by the network equipment through the transceiver unit, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the terminal device includes a transceiver, where the obtaining unit 1010 is specifically configured to: acquiring the first threshold value pre-configured in the terminal equipment; or receiving configuration information sent by a network device through the transceiver unit, where the configuration information includes the first threshold.

Optionally, the communication device is a network device, and the network device includes a transceiver unit, where the obtaining unit 1010 is specifically configured to: and receiving the CBRs of the multiple carriers reported by the terminal equipment through the transceiver unit.

Optionally, the transceiver unit is further configured to: and sending configuration information to the terminal equipment, wherein the configuration information comprises the first threshold value.

It should be understood that the communication device 1000 may perform corresponding operations of the method 500 performed by the communication device in the above method embodiments, and therefore, for brevity, detailed description is omitted here.

Fig. 11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. As shown in fig. 11, the communication device 1100 includes an acquisition unit 1110 and a carrier selection unit 1120. Wherein:

an obtaining unit 1110, configured to obtain channel occupancy ratios CBR of the candidate multiple carriers;

the carrier selecting unit 1120 is configured to, when the value of the resource reselection counter C _ resel is equal to 0, perform carrier selection among the multiple carriers according to the CBRs of the multiple carriers acquired by the acquiring unit.

Therefore, the carrier selection process does not depend on the resource retention probability ProbResourceKeep parameter, but determines whether the carrier selection is required currently or not based on the resource reselection counter C _ resel, so that effective carrier selection is realized, and the complexity of the system is reduced.

Optionally, each carrier of the multiple carriers is configured with a corresponding C _ resel, where the carrier selecting unit 1120 is specifically configured to: and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers.

Optionally, the multiple carriers are configured with the same C _ resel, where the carrier selecting unit 1120 is specifically configured to: and when the same value of the C _ resel is equal to 0, selecting the carrier in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1120 is specifically configured to: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 1110 is specifically configured to: measuring the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, and the terminal device includes a transceiver unit, where the obtaining unit is specifically configured to: and receiving a broadcast message sent by the network equipment through the transceiver unit, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the communication device is a network device, and the network device includes a transceiver unit, where the obtaining unit 1110 is specifically configured to: and receiving the CBRs of the multiple carriers reported by the terminal equipment through the transceiver unit.

It should be understood that the communication device 1100 may perform the corresponding operations of the method 600 performed by the communication device in the above method embodiments, and therefore, for brevity, the description is not repeated herein.

Fig. 12 is a schematic block diagram of a communication device 1200 according to an embodiment of the present application. As shown in fig. 12, the communication apparatus 1200 includes an acquisition unit 1210 and a carrier selection unit 1220. Wherein:

an obtaining unit 1210 configured to obtain channel occupancy ratios CBR of the candidate multiple carriers;

a carrier selecting unit 1220, configured to select a carrier from the multiple carriers according to the CBRs of the multiple carriers acquired by the acquiring unit 1210 when the location of the terminal device moves from the first area to the second area.

Optionally, the carrier selecting unit 1220 is specifically configured to: when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier; and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting the carriers from the carriers according to the CBRs of the carriers.

The carrier selecting unit 1220 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, and the CBR of the first carrier is less than or equal to a second threshold, performing carrier selection in carriers with the CBR less than or equal to the second threshold.

Optionally, the communication device further comprises a determining unit, configured to: when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

the carrier selecting unit 1220 is specifically configured to: if the difference value between the CBR of the first carrier and the CBR of the second carrier after filtering does not exceed the first threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any one carrier from the plurality of carriers as a carrier to be used; or, if the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used.

Optionally, the communication device is a terminal device, and the terminal device includes a transceiver unit, where the obtaining unit 1210 is specifically configured to: acquiring the first threshold value pre-configured in the terminal equipment; or receiving configuration information sent by a network device through the transceiver unit, where the configuration information includes the first threshold.

Optionally, the communication device is a network device, and the network device includes a transceiver unit, where the obtaining unit 1210 is specifically configured to: and sending configuration information to the terminal equipment through the transceiving unit, wherein the configuration information comprises the first threshold value.

Optionally, the carrier selecting unit 1220 is specifically configured to: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the communication device further includes a filtering unit, and the filtering unit is configured to: filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers; the carrier selecting unit 1220 is specifically configured to: and when the position of the terminal equipment moves from the first area to the second area, selecting the carriers in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, the filtering unit is specifically configured to: and performing smooth filtering on the CBRs of the multiple carriers.

Optionally, the communication device further includes a filtering unit, and the filtering unit is configured to: filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

wherein the carrier selecting unit is specifically configured to: when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier; and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.

Optionally, the carrier selecting unit 1220 is specifically configured to: if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, and the filtered CBR of the first carrier is less than or equal to a second threshold, performing carrier selection on carriers whose CBR is less than or equal to the second threshold after filtering.

the carrier selecting unit 1220 is specifically configured to: when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier; if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; or, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting any one carrier from the multiple carriers as a carrier to be used; or, if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting the carrier with the smallest filtered CBR from the multiple carriers as the carrier to be used. Optionally, the carrier selecting unit 1220 is specifically configured to: and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 1210 is configured to: measuring the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, the terminal device includes a transceiver unit, and the obtaining unit 1210 is specifically configured to: and receiving a broadcast message sent by the network equipment through the transceiver unit, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the communication device is a network device, and the network device includes a transceiver unit, where the obtaining unit 1210 is specifically configured to: and receiving the CBRs of the multiple carriers reported by the terminal equipment through the transceiver unit.

It should be understood that the communication device 1200 may perform the corresponding operations of the method 700 performed by the communication device in the above method embodiments, and therefore, for brevity, the description is not repeated herein.

Fig. 13 is a schematic block diagram of a communication device 1300 according to an embodiment of the present application. As shown in fig. 13, the communication apparatus 1300 includes an acquisition unit 1310, a determination unit 1320, and a wave selection unit 1330. Wherein:

an obtaining unit 1310 configured to obtain a candidate channel occupancy ratio CBR of the multiple carriers;

a determining unit 1320, configured to determine whether a CBR of a first carrier exceeds a third threshold, where the first carrier is a carrier used for current data transmission;

a carrier selecting unit 1330, configured to select a carrier from the multiple carriers according to the CBRs of the multiple carriers when the CBR of the first carrier exceeds the third threshold.

Optionally, the plurality of carriers comprises the first carrier.

Optionally, the plurality of carriers does not include the first carrier.

Optionally, the carrier selecting unit 1330 is specifically configured to: and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 1310 is specifically configured to: measuring the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, the terminal device includes a transceiver unit, and the obtaining unit 1310 is specifically configured to: and receiving a broadcast message sent by the network equipment through the transceiver unit, wherein the broadcast message carries candidate CBRs of the multiple carriers.

Optionally, the communication device is a terminal device, and the obtaining unit 1310 is further configured to: acquiring the third threshold value pre-configured in the terminal equipment; or, receiving, by the transceiver unit, configuration information sent by a network device, where the configuration information includes the third threshold.

Optionally, the communication device is a network device, the network device includes a transceiver unit, and the obtaining unit 1310 is specifically configured to: and receiving the CBRs of the multiple carriers reported by the terminal equipment through the transceiver unit.

Optionally, the communication device is a network device, and the transceiver unit is further configured to: and sending configuration information to the terminal equipment, wherein the configuration information comprises the third threshold value.

It should be understood that the communication device 1300 may perform the corresponding operations of the method 800 performed by the communication device in the above method embodiments, and therefore, for brevity, the description is not repeated herein.

Fig. 14 is a schematic block diagram of a communication device 1400 according to an embodiment of the present application. As shown in fig. 14, the communication device includes a processor 1410, a transceiver 1420, and a memory 1430, wherein the processor 1410, the transceiver 1420, and the memory 1430 are in communication with each other through an internal connection path. The memory 1430 is configured to store instructions, and the processor 1410 is configured to execute the instructions stored in the memory 1430 to control the transceiver 1420 to receive signals or transmit signals.

Optionally, the processor 1410 may call the program code stored in the memory 1430 to perform the corresponding operations of the method 400 performed by the communication device in the method embodiment, which are not described herein again for brevity.

Optionally, the processor 1410 may call the program code stored in the memory 1430 to perform the corresponding operations of the method 500 performed by the communication device in the method embodiment, which are not described herein again for brevity.

Optionally, the processor 1410 may call the program code stored in the memory 1430 to perform the corresponding operations of the method 600 performed by the communication device in the method embodiment, which are not described herein again for brevity.

Optionally, the processor 1410 may call the program code stored in the memory 1430 to perform the corresponding operations of the method 700 performed by the communication device in the method embodiment, which are not described herein again for brevity.

Optionally, the processor 1410 may call the program code stored in the memory 1430 to perform the corresponding operations of the method 800 performed by the communication device in the method embodiment, which are not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 15 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 1500 of fig. 15 includes an input interface 1501, an output interface 1502, at least one processor 1503, and a memory 1504, which are interconnected by an internal connection path. The processor 1503 is configured to execute code in the memory 1504.

Optionally, when the code is executed, the processor 1503 may implement the method 400 performed by the communication device in the method embodiment. For brevity, no further description is provided herein.

Optionally, when the code is executed, the processor 1503 may implement the method 500 performed by the communication device in the method embodiment. For brevity, no further description is provided herein.

Optionally, when the code is executed, the processor 1503 may implement the method 600 performed by the communication device in the method embodiment. For brevity, no further description is provided herein.

Optionally, when the code is executed, the processor 1503 may implement the method 700 performed by the communication device in the method embodiment. For brevity, no further description is provided herein.

Optionally, when the code is executed, the processor 1503 may implement the method 800 performed by the communication device in the method embodiment. For brevity, no further description is provided herein.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the unit is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated into one monitoring unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method for carrier selection, the method comprising:

acquiring channel occupation ratios CBR of a plurality of candidate carriers;

filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

and selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 1, wherein the filtering the CBRs for the plurality of carriers comprises:

and performing smooth filtering on the CBRs of the multiple carriers.
The method of claim 2, wherein the CBR for each of the plurality of carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

the carrier wave selection method comprises the steps of filtering each carrier wave, wherein CBR _ new is the CBR of each carrier wave after filtering, CBR _ current is the CBR of each carrier wave before filtering, CBR _ old is the CBR of each carrier wave after filtering when the last carrier wave is selected, and a is a filter coefficient and is more than or equal to 0 and less than or equal to 1.
The method according to any one of claims 1 to 3, further comprising:

determining whether the CBR of a filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 4, wherein the plurality of carriers comprises the first carrier.
The method of claim 4, wherein the plurality of carriers does not include the first carrier.
The method according to any one of claims 1 to 3, further comprising:

determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 7, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the plurality of filtered carriers exceeds the first threshold according to the filtered CBRs of the plurality of carriers.
The method according to claim 7 or 8, wherein the method is performed by a terminal device, the method further comprising:

the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or

And the terminal equipment receives configuration information sent by network equipment, wherein the configuration information comprises the first threshold value.
The method of claim 7 or 8, wherein the method is performed by a network device, the method further comprising:

and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.
The method according to any one of claims 4 to 10, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers includes:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 11, wherein if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold for a preset duration, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers, comprising:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.
The method according to any one of claims 4 to 10, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers includes:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 13, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or

And if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the filtered CBR is smaller than or equal to the second threshold value.
The method according to any one of claims 1 to 3, further comprising:

determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; or

If the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting any carrier from the multiple carriers as a carrier to be used; or

And if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used.
The method according to any of claims 1 to 3, wherein the carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and when the value of the resource reselection counter C _ resel is equal to 0, selecting the carriers from the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 16, wherein each of the plurality of carriers has a corresponding C _ resel configured thereon,

when the value of C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including:

and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, selecting the carrier in the plurality of carriers according to the filtered CBR of the plurality of carriers.
The method of claim 16, wherein the plurality of carriers have a same C _ resel configured thereon,

when the value of C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to the filtered CBRs of the multiple carriers, including:

and when the same value of C _ resel is equal to 0, selecting carriers from the multiple carriers according to the filtered CBRs of the multiple carriers.
The method according to any one of claims 1 to 3, further comprising:

when the value of C _ resel is equal to 0, determining whether the CBR of a filtered first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 19, wherein the plurality of carriers comprises the first carrier.
The method of claim 19, wherein the plurality of carriers does not include the first carrier.
The method according to any of claims 19 to 21, wherein each of the plurality of carriers is configured with a corresponding C _ resel,

wherein the determining whether the CBR of the filtered first carrier exceeds a third threshold when the value of C _ resel is equal to 0 includes:

when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the filtered CBR of the first carrier exceeds the third threshold.
The method according to any of claims 19 to 21, wherein the plurality of carriers are configured with the same C _ resel,

wherein the determining whether the CBR of the filtered first carrier exceeds a third threshold when the value of C _ resel is equal to 0 includes:

determining whether the filtered CBR of the first carrier exceeds a third threshold when the value of the same C _ resel is equal to 0.
The method according to any one of claims 1 to 3, further comprising:

when the value of C _ resel is equal to 0, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 24, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.
The method according to claim 24 or 25, wherein the method is performed by a terminal device, the method further comprising:

the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or

And the terminal equipment receives configuration information sent by network equipment, wherein the configuration information comprises the first threshold value.
The method of claim 24 or 25, wherein the method is performed by a network device, the method further comprising:

and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.
The method according to any of claims 24 to 27, wherein each of the plurality of carriers is configured with a corresponding C _ resel,

wherein determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold when the value of C _ resel is equal to 0 comprises:

when a value of C _ resel corresponding to a carrier used for current data transmission in a plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.
The method according to any of claims 24 to 27, wherein the plurality of carriers are configured with the same C _ resel,

wherein determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold when the value of C _ resel is equal to 0 comprises:

when the value of the same C _ resel is equal to 0, determining whether a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold.
The method according to any of claims 24 to 29, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 30, wherein if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold for a preset duration, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers, comprising:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.
The method according to any of claims 24 to 29, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 32, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the filtered CBR is smaller than or equal to the second threshold value.
The method according to any one of claims 1 to 3, further comprising:

determining whether a difference value between a filtered CBR of a first carrier and a filtered CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

wherein the carrier selection is performed in the plurality of carriers according to the filtered CBRs of the plurality of carriers, and includes:

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; or

If the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting any carrier from the multiple carriers as a carrier to be used; or

And if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used.
The method according to any of claims 1 to 34, wherein said performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.
The method according to any of claims 1 to 35, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.
The method according to any of claims 1 to 35, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.
The method of any one of claims 1 to 35, wherein the method is performed by a network device, and wherein the obtaining the CBRs of the candidate plurality of carriers comprises:

and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.
The method according to any of claims 1 to 38, wherein said carrier selection procedure is independent of a resource holding probability ProbResourceKeep parameter.
The method of any one of claims 1 to 39, wherein the CBR of each of the plurality of carriers is a CBR of a resource pool used by a terminal device on each of the carriers.
The method according to claim 40, wherein the resource pool used by the terminal device on each carrier is a resource pool corresponding to a region where the terminal is located, among a plurality of resource pools, and there is a correspondence between the plurality of resource pools and the plurality of regions.
A method for carrier selection, the method comprising:

acquiring channel occupation ratios CBR of a plurality of candidate carriers;

determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any carrier except the first carrier in the plurality of carriers;

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 42, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.
The method of claim 43, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and lasts for a preset time length, selecting carriers from the carriers according to the CBRs of the carriers.
The method of claim 43, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold for a preset duration comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.
The method of claim 43, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 46, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or

And if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the CBR is smaller than or equal to the second threshold value.
The method of any one of claims 42 to 47, further comprising:

if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; or

If the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any carrier from the plurality of carriers as a carrier to be used; or

And if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used.
The method of any one of claims 42 to 48, wherein determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

when the value of the resource reselection counter C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.
The method of claim 49, wherein each carrier of the plurality of carriers has a corresponding C _ resel configured thereon,

wherein determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold when the value of C _ resel is equal to 0 comprises:

when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, determining whether the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.
The method of claim 49, wherein the plurality of carriers have a same C _ resel configured thereon,

wherein determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold when the value of C _ resel is equal to 0 comprises:

when the value of the same C _ resel is equal to 0, determining whether a difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold.
The method according to any of claims 42-51, wherein said carrier selection among said plurality of carriers comprises:

and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.
The method of any one of claims 42 to 52, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.
The method of any one of claims 42 to 52, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.
The method of any one of claims 42 to 54, further comprising:

the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; or

And the terminal equipment receives configuration information sent by network equipment, wherein the configuration information comprises the first threshold value.
The method of any one of claims 42 to 52, wherein the method is performed by a network device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.
The method of claim 56, further comprising:

and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.
The method according to any of the claims 42 to 57, wherein said carrier selection procedure is independent of the resource holding probability ProbResourceKeep parameter.
The method of any one of claims 42 to 58, wherein the CBR of each of the plurality of carriers is a CBR of a resource pool used by a terminal device on the each carrier.
The method according to claim 59, wherein the resource pool used by the terminal device on each of the carriers is a resource pool corresponding to a region where the terminal is located, among a plurality of resource pools, and there is a correspondence between the plurality of resource pools and the plurality of regions.
A method for carrier selection, the method comprising:

acquiring channel occupation ratios CBR of a plurality of candidate carriers;

and when the value of the resource reselection counter C _ resel is equal to 0, selecting the carriers from the multiple carriers according to the CBRs of the multiple carriers.
The method of claim 61, wherein each carrier of the plurality of carriers has a corresponding C _ resel configured thereon,

when the value of C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including:

and when the value of C _ resel corresponding to the carrier used for current data transmission in the plurality of C _ resels configured on the plurality of carriers is equal to 0, carrier selection is performed in the plurality of carriers according to CBRs of the plurality of carriers.
The method of claim 61, wherein the plurality of carriers have a same C _ resel configured thereon,

when the value of C _ resel is equal to 0, carrier selection is performed in the multiple carriers according to CBRs of the multiple carriers, including:

and when the same value of the C _ resel is equal to 0, selecting the carrier in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of any one of claims 61 to 63, further comprising:

when the value of C _ resel is equal to 0, determining whether the CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

wherein the selecting carriers among the plurality of carriers according to the CBRs of the plurality of carriers includes:

and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 64, wherein the plurality of carriers comprises the first carrier.
The method of claim 64, wherein the plurality of carriers does not comprise the first carrier.
The method according to any one of claims 61 to 66, wherein said performing carrier selection among the plurality of carriers according to CBRs of the plurality of carriers comprises:

and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.
The method of any one of claims 61 to 67, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.
The method of any one of claims 61 to 67, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.
The method of any one of claims 61 to 67, wherein the method is performed by a network device, and wherein the obtaining CBRs for candidate multiple carriers comprises:

and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.
The method according to any of the claims 61 to 70, wherein said carrier selection procedure is not related to the resource conservation probability ProbResourceKeep parameter.
The method of any one of claims 61 to 71, wherein the CBR of each of the plurality of carriers is a CBR of a resource pool used by a terminal device on the each carrier.
The method according to claim 72, wherein the resource pool used by the terminal device on each carrier is a resource pool corresponding to a region where the terminal is located, among a plurality of resource pools, and there is a correspondence between the plurality of resource pools and the plurality of regions.
A method for carrier selection, the method comprising:

acquiring channel occupation ratios CBR of a plurality of candidate carriers;

and when the position of the terminal equipment moves from the first area to the second area, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 74, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers when the location of the terminal device moves from a first area to a second area comprises:

when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, selecting the carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 75, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the CBRs of the plurality of carriers.
The method of claim 75, wherein the performing carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting the carriers from the carriers according to the CBRs of the carriers.
The method of claim 77, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold for a preset duration comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the CBR of the first carrier and the CBR of the first carrier exceeds the first threshold value according to the CBRs of the plurality of carriers.
The method of claim 75, wherein the performing carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value and the CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 79, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if the difference between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold comprises:

if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; or

And if the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds the first threshold value, and the CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the CBR is smaller than or equal to the second threshold value.
The method of claim 74, further comprising:

when the position of the terminal equipment moves from a first area to a second area, determining whether a difference value between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold value, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the carriers except the first carrier;

if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the first carrier as a carrier to be used; or

If the difference between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting any carrier from the plurality of carriers as a carrier to be used; or

And if the difference value between the CBR of the first carrier and the CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used.
The method according to any one of claims 74 to 81, wherein the method is performed by a terminal device, the method further comprising:

the terminal equipment acquires the first threshold value pre-configured in the terminal equipment; alternatively, the first and second electrodes may be,

and the terminal equipment receives configuration information sent by network equipment, wherein the configuration information comprises the first threshold value.
The method of any one of claims 74 to 81, wherein the method is performed by a network device, the method further comprising:

and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the first threshold value.
The method according to any of claims 74-83, wherein said carrier selection among said plurality of carriers according to CBRs of said plurality of carriers comprises:

and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.
The method of claim 74, further comprising:

filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including:

and when the position of the terminal equipment moves from the first area to the second area, selecting the carriers in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method as claimed in claim 85, wherein the filtering the CBRs for the plurality of carriers comprises:

and performing smooth filtering on the CBRs of the multiple carriers.
The method of claim 86, wherein the CBR for each of the plurality of carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

the carrier wave selection method comprises the steps of filtering each carrier wave, wherein CBR _ new is the CBR of each carrier wave after filtering, CBR _ current is the CBR of each carrier wave before filtering, CBR _ old is the CBR of each carrier wave after filtering when the last carrier wave is selected, and a is a filter coefficient and is more than or equal to 0 and less than or equal to 1.
The method of claim 74, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers when the location of the terminal device moves from a first area to a second area comprises:

when the position of the terminal equipment moves from the first area to the second area, determining whether the CBR of a first carrier exceeds a third threshold value, wherein the first carrier is a carrier used for current data transmission;

and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 88, wherein the plurality of carriers comprises the first carrier.
The method of claim 88, wherein the plurality of carriers does not comprise the first carrier.
The method of claim 74, further comprising:

filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including:

when the position of the terminal device moves from the first area to the second area, determining whether the CBR of the filtered first carrier exceeds a third threshold, where the first carrier is a carrier used for current data transmission;

and if the filtered CBR of the first carrier exceeds the third threshold, carrier selection is carried out in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 91, wherein the plurality of carriers comprises the first carrier.
The method of claim 91, wherein the plurality of carriers does not comprise the first carrier.
The method according to any of claims 91-93, wherein the filtering the CBRs for the plurality of carriers comprises:

and performing smooth filtering on the CBRs of the multiple carriers.
The method of claim 94, wherein the CBR for each of the plurality of carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

the carrier wave selection method comprises the steps of filtering each carrier wave, wherein CBR _ new is the CBR of each carrier wave after filtering, CBR _ current is the CBR of each carrier wave before filtering, CBR _ old is the CBR of each carrier wave after filtering when the last carrier wave is selected, and a is a filter coefficient and is more than or equal to 0 and less than or equal to 1.
The method of claim 74, further comprising:

filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including:

when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier;

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, carrying out carrier selection in the plurality of carriers according to the filtered CBRs of the plurality of carriers.
The method of claim 96, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the CBR of the first carrier exceeds the first threshold according to the filtered CBRs of the plurality of carriers.
The method as claimed in claim 96 or 97, wherein the filtering the CBRs of the plurality of carriers comprises:

and performing smooth filtering on the CBRs of the multiple carriers.
The method of claim 98, wherein the CBR for each of the plurality of carriers after the smoothing filtering is:

CBR_new＝a×CBR_old+(1-a)×CBR_current，

the carrier wave selection method comprises the steps of filtering each carrier wave, wherein CBR _ new is the CBR of each carrier wave after filtering, CBR _ current is the CBR of each carrier wave before filtering, CBR _ old is the CBR of each carrier wave after filtering when the last carrier wave is selected, and a is a filter coefficient and is more than or equal to 0 and less than or equal to 1.
The method of any one of claims 96 to 99, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, then performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 100, wherein if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold for a preset duration, performing carrier selection among the multiple carriers according to the filtered CBRs of the multiple carriers, comprising:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value and lasts for a preset time length, selecting one carrier as a carrier to be used from the carriers of which the difference value between the filtered CBR of the first carrier and the filtered CBR of the first carrier exceeds the first threshold value according to the filtered CBRs of the multiple carriers.
The method of any one of claims 96 to 99, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers if a difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds a first threshold comprises:

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is greater than a second threshold value, carrying out carrier selection in the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 102, wherein if the difference between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold, performing carrier selection among the plurality of carriers according to the filtered CBRs of the plurality of carriers comprises:

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, selecting the first carrier as a carrier to be used; alternatively, the first and second electrodes may be,

and if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier exceeds the first threshold value, and the filtered CBR of the first carrier is smaller than or equal to a second threshold value, carrying out carrier selection in the carriers of which the filtered CBR is smaller than or equal to the second threshold value.
The method of claim 74, further comprising:

filtering the CBRs of the multiple carriers to obtain filtered CBRs of the multiple carriers;

when the position of the terminal device moves from a first area to a second area, carrier selection is performed in the plurality of carriers according to the CBRs of the plurality of carriers, including:

when the position of the terminal device moves from the first area to the second area, determining whether a difference value between a CBR of a first filtered carrier and a CBR of a second filtered carrier exceeds a first threshold, wherein the first carrier is a carrier used for current data transmission, and the second carrier is any one of the plurality of carriers except the first carrier;

if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold value, selecting the first carrier as a carrier to be used; or

If the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting any carrier from the multiple carriers as a carrier to be used; or

And if the difference value between the filtered CBR of the first carrier and the filtered CBR of the second carrier does not exceed the first threshold, selecting the carrier with the minimum filtered CBR from the plurality of carriers as the carrier to be used.
The method according to any one of claims 96-104, wherein the carrier selection among the plurality of carriers according to the CBRs of the plurality of carriers comprises:

and selecting the carrier with the minimum filtered CBR from the plurality of carriers as a carrier to be used according to the filtered CBRs of the plurality of carriers.
The method of any one of claims 74 to 105, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.
The method of any one of claims 74 to 105, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.
The method of any one of claims 74 to 105, wherein the method is performed by a network device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.
The method of any one of claims 74 to 108, wherein the CBR of each of the plurality of carriers is a CBR of a resource pool used by a terminal device on said each carrier.
The method of claim 109, wherein the resource pool used by the terminal device on each carrier is a resource pool corresponding to a region where the terminal is located in a plurality of resource pools, and wherein the plurality of resource pools and the plurality of regions are in correspondence.
A method for carrier selection, the method comprising:

acquiring channel occupation ratios CBR of a plurality of candidate carriers;

determining whether the CBR of a first carrier exceeds a third threshold, wherein the first carrier is a carrier used for current data transmission;

and if the CBR of the first carrier exceeds the third threshold, selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers.
The method of claim 111, wherein the plurality of carriers comprises the first carrier.
The method of claim 111, wherein the plurality of carriers does not include the first carrier.
The method according to any of claims 111-113, wherein said carrier selection among said plurality of carriers comprises:

and selecting the carrier with the minimum CBR from the plurality of carriers as the carrier to be used according to the CBRs of the plurality of carriers.
The method of any one of claims 111 to 114, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate multiple carriers comprises:

and the terminal equipment measures the CBRs of the multiple carriers to obtain the CBRs of the multiple carriers.
The method of any one of claims 111 to 115, wherein the method is performed by a terminal device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the terminal equipment receives a broadcast message sent by the network equipment, wherein the broadcast message carries candidate CBRs of the multiple carriers.
The method of any one of claims 111 to 116, further comprising:

the terminal equipment acquires the third threshold value pre-configured in the terminal equipment; or

And the terminal equipment receives configuration information sent by network equipment, wherein the configuration information comprises the third threshold value.
The method of any one of claims 111 to 117, wherein the method is performed by a network device, and wherein the obtaining CBRs for the candidate plurality of carriers comprises:

and the network equipment receives the CBRs of the multiple carriers reported by the terminal equipment.
The method of claim 118, further comprising:

and the network equipment sends configuration information to terminal equipment, wherein the configuration information comprises the third threshold value.
The method of any one of claims 111 to 119, wherein the CBR for each carrier of the plurality of carriers is a CBR for a resource pool used by a terminal device on the each carrier.
The method of claim 120, wherein the resource pool used by the terminal device on each carrier is a resource pool corresponding to a region where the terminal is located, among a plurality of resource pools, and a correspondence relationship exists between the plurality of resource pools and the plurality of regions.
A communication device, characterized in that the communication device comprises:

an obtaining unit, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

the filtering unit is configured to perform filtering processing on the CBRs of the multiple carriers acquired by the acquiring unit to obtain filtered CBRs of the multiple carriers;

and the carrier selecting unit is used for selecting carriers from the plurality of carriers according to the CBRs of the plurality of carriers filtered by the filtering unit.
A communication device, characterized in that the communication device comprises:

an obtaining unit, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

a determining unit, configured to determine whether a difference between a CBR of a first carrier and a CBR of a second carrier exceeds a first threshold, where the first carrier is a carrier used for current data transmission, and the second carrier is any one of the multiple carriers except the first carrier;

and the carrier selecting unit is used for selecting the carriers in the plurality of carriers according to the CBRs of the plurality of carriers acquired by the acquiring unit when the difference value between the CBR of the first carrier and the CBR of the second carrier exceeds a first threshold value.
A communication device, characterized in that the communication device comprises:

an obtaining unit, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

and the carrier selecting unit is used for selecting the carriers in the plurality of carriers according to the CBRs of the plurality of carriers acquired by the acquiring unit when the value of the resource reselection counter C _ resel is equal to 0.
A communication device, characterized in that the communication device comprises:

an obtaining unit, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

and the carrier selecting unit is used for selecting carriers in the plurality of carriers according to the CBRs of the plurality of carriers acquired by the acquiring unit when the position of the terminal equipment moves from the first area to the second area.
A communication device, characterized in that the communication device comprises:

an obtaining unit, configured to obtain channel occupancy ratios CBR of a plurality of candidate carriers;

a determining unit, configured to determine whether a CBR of a first carrier exceeds a third threshold, where the first carrier is a carrier used for current data transmission;

and the carrier selecting unit is used for selecting the carriers in the plurality of carriers according to the CBRs of the plurality of carriers when the CBR of the first carrier exceeds the third threshold.
A communication device comprising a processor configured to invoke instructions stored in a memory to perform the method of any of claims 1 to 121.
A storage medium storing a computer program, the computer program, when executed by a computing device, causing the storage medium to implement the method of any of claims 1 to 121.
A chip, characterized in that it comprises a processor for calling up and running a computer program from a memory, so that a device in which the chip is installed performs the authentication method according to any one of claims 1 to 121.